Method of Transmitting and Receiving Control Information for Point-To-Multipoint Multimedia Multicast Service

1. A method of receiving control information from a network by a mobile terminal in a wireless communication system, the method comprising: receiving information of a specified number of groups, wherein a plurality of point-to-multipoint services are divided into the specified number of groups; receiving the specified number of Multimedia Broadcast/Multicast Service Control Channel (MCCH) messages per a first period during a second period, wherein the MCCH messages comprise modified information (MSI) and a part of unmodified information (USI), wherein the second period is the specified number times of the first period; and acquiring the control information from the specified number of MCCH messages, wherein the unmodified information is divided into the specified number of parts, wherein each of the specified number of parts of the unmodified information corresponds to each of the specified number of groups and is included in a MCCH message sequentially per the first period, and wherein the control information is related to the plurality of point-to-multipoint services.

2. The method of claim 1 , wherein each MCCH message is received through a control channel.

3. The method of claim 2 , wherein the control channel is a Multimedia Broadcast/Multicast Service Control Channel (MCCH).

4. The method of claim 1 , wherein at least the modified information or unmodified information is updated during each first period.

5. A method of transmitting control information to a mobile terminal from a network in a wireless communication system, the method comprising: grouping a plurality of point-to-multipoint services into a specified number of groups; transmitting information of the specified number of groups; and transmitting the specified number of Multimedia Broadcast/Multicast Service Control Channel (MCCH) messages per a first period during a second period, wherein the MCCH messages comprise modified information (MSI) and a part of unmodified information (USI), wherein the second period is the specified number times of the first period, wherein the control information is acquired from the specified number of MCCH messages, wherein the unmodified information is divided into the specified number of parts, wherein each of the specified number of parts of the unmodified information corresponds to each of the specified number of groups and is included in a MCCH message sequentially per the first period, and wherein the control information is related to the plurality of point-to-multipoint services.

6. The method of claim 5 , wherein each MCCH message is received through a control channel.

7. The method of claim 6 , wherein the control channel is a Multimedia Broadcast/Multicast Service Control Channel (MCCH).

8. The method of claim 5 , wherein at least the modified information or unmodified information is updated during each first period.

9. The method of claim 1 , wherein the modified information includes information on modified point-to-multipoint services regardless of which group the modified point-to-multipoint services are included, and wherein the part of the unmodified information included in the MCCH message received at a specific first period includes information on unmodified point-to-multipoint services included in a specific group corresponding to the specific first period.

10. The method of claim 5 , wherein the modified information includes information on modified point-to-multipoint services regardless of which group the modified point-to-multipoint services are included, and wherein the part of the unmodified information included in the MCCH message transmitted at a specific first period includes information on unmodified point-to-multipoint services included in a specific group corresponding to the specific first period.